/*
 * Copyright 2021 Shulie Technology, Co.Ltd
 * Email: shulie@shulie.io
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.shulie.surge.data.runtime.disruptor;

import io.shulie.surge.data.runtime.disruptor.util.Util;

import java.util.Arrays;

/**
 * Hides a group of Sequences behind a single Sequence
 */
public final class FixedSequenceGroup extends Sequence
{
	private final Sequence[] sequences;

	/**
	 * Constructor
	 *
	 * @param sequences the list of sequences to be tracked under this sequence group
	 */
	public FixedSequenceGroup(Sequence[] sequences)
	{
		this.sequences = Arrays.copyOf(sequences, sequences.length);
	}

	/**
	 * Get the minimum sequence value for the group.
	 *
	 * @return the minimum sequence value for the group.
	 */
	@Override
	public long get()
	{
		return Util.getMinimumSequence(sequences);
	}

	@Override
	public String toString()
	{
		return Arrays.toString(sequences);
	}

	/**
	 * Not supported.
	 */
	@Override
	public void set(long value)
	{
		throw new UnsupportedOperationException();
	}

	/**
	 * Not supported.
	 */
	@Override
	public boolean compareAndSet(long expectedValue, long newValue)
	{
		throw new UnsupportedOperationException();
	}

	/**
	 * Not supported.
	 */
	@Override
	public long incrementAndGet()
	{
		throw new UnsupportedOperationException();
	}

	/**
	 * Not supported.
	 */
	@Override
	public long addAndGet(long increment)
	{
		throw new UnsupportedOperationException();
	}
}
